How Could I Be So Stupid/Careless?

Not me, but my asshole brother long ago, rebuilt the 429 SCJ and toploader 4 speed from his 71 Mach 1 Mustang. I was about 13 years old at the time and got to "help" the reinstall by fetching tools, laying under the car for hour holding up the headers, etc.
When he was attempting to fire it for the first time, it would backfire and blow out the carb base gasket. After the 4th or 5th time, I finally suggested that maybe he should put the lockwashers on the top of the carb, rather than underneath it. He was pretty pissed when I told him that I had seen it after the first time, but figuring he was smarter than me, I didn't say anything.
:rofl: